Disassemblable rolling mill stand

ABSTRACT

Disassemblable rolling mill stand, of the type involving a bedplate structure with a substantially “U”-shaped embedding structure ( 1 ), within which the rolling mill assembly is embedded and fixed ( 2 ), with at least one couple of horizontal rolling cylinders ( 210–310 ), by fixing means ( 202 - 10/12 ), of said substantially “U”-shaped embedding structure, which extends upwards at least up to the upper horizontal cylinder axis of said couple of horizontal rolling cylinders ( 210–310 ) and makes up vertical sliding jointed guide elements ( 11–110 ) with corresponding opposite vertical counter-guides ( 201 ) in the rolling mill assembly ( 2 ).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention are also relates to a disassemblable rolling millstand.

2. Description of the Related Art

In prior art, disassemblable rolling mill stands are known. Solutions ofdisassemblable rolling mill stands are known, see for exampleIT-UD91A000118 (U.S. Pat. No. 5,457,979) and PCT/IT/97/00237 (WO98/15365) that uses two couples of screw-stays or screw tie-rods (1, 2,3, 4), to join and tie the different components of a horizontal rollingstand, using a “U” shaped support basement realizing a cage (9) thatextends upwards with uprights (90) till to enclose the lower part,including the lower horizontal cylinder (5, 1), of the whole horizontalrolling stand. U.S. Pat. No. 5,613,392 discloses a similar horizontalrolling stand with “U”-shaped basement whose uprights (2) extend upwardsto encase (cage) the whole structure of the roller assemblies (bothlower and upper cylinder). A “U” shape basement is also disclosed inEP-A-0040584 (Ref. 24), regarding a stand for stationary rolling line,but the uprights (24) of this “U”-shaped basement do not extend toenclose the lower horizontal cylinder. U.S. Pat. No. 5,497,644 disclosesa disassemblable universal rolling mill stand with a flat basement nothaving a “U”-shape feature.

Because of their being disassemblable, the present rolling mill standshave a limited solidity or strength and anyway the fact of beingdisassemblable limits their reliability, also making the assemblingsystem complex.

However, the disassemblable rolling mill stands have great advantages,first of all, the possibility of interchanging the different componentelements and also of easily intervening for the change or maintenance oftheir parts and of the component elements subjected to wear such as therolling cylinders.

The purpose of the present invention is that of obviating the abovementioned drawbacks and of providing in particular a simple rolling millstand, more efficient, with a complete, easy and fast interchangeabilityof the component parts, and nevertheless, having the highestcompactedness and strength.

BRIEF SUMMARY OF THE INVENTION

The problem is solved as claimed by means of a disassemblable rollingmill stand, of the type involving a substantially “U”-shaped embeddingbedplate structure, within which the rolling mill assembly, with atleast a couple of horizontal rolling cylinders, is embedded and fixed byfixing means, characterised in that said substantially “U”-shapedembedding structure:

-   -   extends upwards with opposite uprights, up to at least the upper        horizontal cylinder axis of said couple of horizontal rolling        cylinders;    -   it makes up vertical sliding jointed guide elements with        corresponding opposite vertical counter-guides in said rolling        mill assembly which couple inside of said opposite uprights with        external retaining side extension, making up a joint, on the        horizontal plane, with guide walls substantially shaped like two        outwardly opened opposite “C”. Thus there is the advantage of        simplifying the structure even allowing the total        disassemblability and the highest compactedness and strength. In        particular the guide system with opposite vertical guide        uprights with inside-outside embedding, gives the highest        solidity and safety in addition to a functionality which equals        the integral structures, reducing at the minimum the slacks and        dangers deriving from loosening.

Advantageously in the universal stand solutions eight horizontal largescrews, four by four opposite, which at the same time tighten on thehorizontal centre rolling mill assembly, two side extractableassemblies, and the whole assembly between said uprights, are used.

In the alternative said bedplate is intended to receive a rolling millassembly with horizontal cylinders with eight engaged pivoting largescrews: four upper screws on the guide uprights and four at the base.

These and other advantages will appear from the following description ofa preferential embodiment solution, with the aid of the encloseddrawings, whose execution details are not to be considered as limitingbut are only given as an example.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

FIGS. 1 and 2 are front and side elevation schematic views of therolling mill stand operationally assembled with the universal rollingmill assembly with horizontal and vertical rolling cylinders.

FIGS. 3 and 4 are front elevation schematic views like the precedingones, of the universal rolling mill stand (FIG. 3) operationallyextracted from its bedplate (FIG. 4).

FIGS. 5 and 6 are side elevation schematic views with respect to thepreceding ones, of the universal rolling mill stand (FIG. 5)operationally extracted from its bedplate (FIG. 6), with respect to thefigure (2).

FIGS. 7, 8 show a front and plan elevation view of the universal rollingmill assembly, with side opposite extraction of the respective verticalrolling mill assemblies.

FIGS. 9 and 10 show a front and side elevation view of the rolling millstand with rolling mill assembly with a single couple of horizontalcylinders.

FIGS. 11–14 are schematic side views showing the invention as in thepreceding figures, with extracted rolling mill stand (FIGS. 11–12) withrespect to the underlying bedplate (FIG. 13–14).

DETAILED DESCRIPTION OF THE INVENTION

As it can be noticed in the above shown figures, the invention issubstantially embodied in a disassemblable rolling mill stand, of thetype involving a base structure (1) with a substantially “U”-shapedembedding structure (1), within whose uprights (11) the rolling millassembly is embedded and fixed (2), with at least one couple ofhorizontal rolling cylinders (210–310), by screw fixing means(202-10/12).

The substantially “U”-shaped embedding structure:

-   -   extends upwards with said guide uprights (11), advantageously up        to the upper horizontal cylinder axis of said couple of        horizontal rolling cylinders (210–310);    -   it makes up vertical sliding jointed guide elements (11–110)        with corresponding opposite vertical counter-guides (210) in the        rolling mill assembly (2) with substantially opposite “C”-shaped        embedding on the vertical plane, by jointing with side retention        (201–110) of said guide uprights (11).

Said rolling mill assembly advantageously consists of a universalassembly with horizontal centre rolling mill assembly (21) with a coupleof horizontal cylinders (210), laterally and in opposition to which, twovertical rolling mill assemblies are tightened (22) by means of eightopposite horizontal large screws (202).

In the preferential solution said rolling mill assembly (2) is tightenedsimultaneously between said vertical guide uprights (11) of saidbedplate (1), always by said eight opposite horizontal large screws(202). Alternately said rolling mill assembly (2) includes a singlecouple of horizontal rolling cylinders (3–310).

In such a case the rolling mill assembly fixing means (3) consist ofeight rotatable large screws (10–12) pivoted:

-   -   four of them upperly (10) on the corners of the guide uprights        (11) and    -   four of them on said bedplate (12).

Advantageously said rolling mill assembly (2) includes two couples ofscrew-stays (212) operating on respective gaskets for the holding ofhorizontal rolling cylinders (210).

The motion transmission system for the removal and approach of thehorizontal rolling cylinders (210–310) occurs by means of saidscrew-stays (212–312) which drive said cylinders-holder gasketsrespectively upper one (3100) and lower one (3101) and by means of theupper transmission assembly (211–311).

The adjustment structure being drawn from IT-UD91A000118 andPCT/IT97/00237.

200 Indicates the vertical coupling surface of the guide sides 201 ofthe rolling mill assembly 2, which engage above the uprights 11 of thebedplate matching with its sides (110).

1. A disassemblable rolling mill stand comprising: a bedplate structurehaving a substantially U-shaped embedding structure; a rolling millassembly positioned within said bedplate structure, said rolling millassembly having at least a pair of horizontal rolling cylinders, saidrolling mill assembly being embedded and affixed to said bedplate, saidembedding structure extending upwardly with opposite vertical-guideuprights having at least one of said pair of horizontal rollingcylinders therein, said embedding structure having opposite verticalcounter-guides in said rolling mill assembly, said opposite verticalcounter-guides coupled inside of said opposite vertical-guide uprights,said opposite vertical counter-guides having external side retainingextensions with sliding surfaces, said external side retainingextensions horizontally outwardly opened.
 2. The stand of claims 1, saidrolling mill assembly being a universal rolling mill assembly having apair of extractable vertical rolling mill side assemblies which arelaterally extractable, said pair of extractable vertical rolling millside assemblies being interchangeably mounted by eight horizontal screwsarranged four by four.
 3. The stand of claim 2, said eight horizontalscrews guiding and tightening said universal rolling mill assemblybetween said opposite vertical-guide uprights.
 4. The stand of claim 1,said rolling mill assembly having only a single pair of horizontalrolling cylinders.
 5. The stand of claim 1, said rolling mill assemblyaffixed by eight rotatable screws to said bedplate, four screws of saideight rotatable screws affixed to corners of said oppositevertical-guide uprights of said bedplate structure, another four of saideight rotatable screws being affixed to a base of said bedplatestructure.
 6. The stand of claim 1, said rolling mill assemblycontaining two pairs of screwable stayrods supporting the horizontalrolling cylinders.